Answer
All you have to do is send your parents an email and you are done. Also, you could fax one to your parents with your signature. A release form is just a consent. All you need to do is type or write something like: To whom it may concern, I hereby allow Mr and Mrs. _______ to be the legal guardians and allow them to take my son for treatment at a doctor while I am town. - (Insert Signature here) or something like that.